You know when we (they) tell you not to do any personal computing on work devices/systems and to keep your devices completely separate from work ones.

Yeah this (and lawsuits/investigations) are why, the employer owns the data, in some contexts (like this one) it can become an asset (or a liability) but in either case it's not yours.

Of course that only gets you part of the way there anyway see Twitch recently opting in all users by default to mined for AI and only adding an opt out after backlash with a quote that was so on the nose it made me stop "If we'd have asked them to opt in, they wouldn't have opted in" (paraphrasing but it was that blunt).